4:1 (or perhaps closer) of a BB ball using my Tamron SP90 + kenko DGX 2x TC + fuji adapter + Fuji's 2x TC on X-T3. Probably my usual f/32 aperture, and a smidge of room to wiggle.
Heavy crops on this guy, but the AF blew my mind!
Absolute cheat to get these guys at a show, but at the same time - 15 minutes out for guaranteed awesome shots - you just don't say no to!